My 6 tear old son just got glasses. The doctor said to wear them at all times. Can someone explain what it all means?

Sphere r +.50
Sphere l +1.50

Cylinder r -.75
Cylinder l -2.00

Axis r 25
Axis l 130

I understand he has an astigmatism but I guess I'm just not sure how that effects his vision. I also see that the sphere is + which I thought was far sighted, which is what confuses me why he should wear them at all times. Thank you!